'''Polemius Silvius''' (''wikt:floruit|fl.
'' 5th century) was the author of an annotated Julian calendar
that attempted to integrate the traditional Roman festival|Roman festival cycle
with the new Christian
holy days.Giusto Traina, ''428 AD: An Ordinary Year at the End of the Roman Empire'' (Princeton University Press, 2009, from the original Italian edition of 2007), p. 180. His calendar, also referred to as a laterculus
'', dates to around 448–449.Mary Beard (classicist)|Mary Beard
, J.A. North, and S.R.F. Price, ''Religions of Rome: A Sourcebook'' (Cambridge University Press, 1998), p. 69. He was active in southeastern Gaul
.J.N. Adams, ''The Regional Diversification of Latin, 200 BC–AD 600'' (Cambridge University Press, 2007), p. 295.